Carbureter.



R. A. DUFF.

CARBURETEB.

arrucnmu FILED 558.12, me. RENEWED JUNE 1. 1918.

1,285,648. Patented Nov. 26,1918. I

2 SHEETS-SHEET ll W1tnesses enter Attorn eys Patented Nov. 26, 1918.

2 SHEETS-SHEET 2.

Witnesses Attorneys UNITED srrns RALPH A. DUFF, OF NEBRASKA CITY, NEBRASKA.

CARBURETER.

Application filed February 12,- 1916, Serial No. 77,941.

One of the objects of the invention is to provide a special starting jet with which is combined means for directing the explosive mixture past the butterfly or throttle valve into the manifold portion of the carbureter.

A further object is to so dispose the air inlet relative to the gas jets or nozzle as to result in a more thorough breaking up of the gas jets and the commingling of the gas with the air than has heretofore been possi le.

Another object is to provide means whereby any possible leakage of gas from the starting jet or nozzle is prevented while said jet, or nozzle is cut' out or is in inactive position.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can bemade within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has [been shown.

In said drawings Figure 1 is a side elevation of a carbureter embodying the present improvements.

Fig. 2 is a vertical longitudinal section therethrough, parts being broken away.

Fig. 3 is a view partly in end elevation and partly in section. Fig.4 is a section on line A-B Fig. 2. Fig. 5 is a perspective view of the fuel valve.

Fig. 6 is a inlet valve.

Referring to the figures by characters of reference 1 desi nates a float chamber having the usual fl bat 2 for maintaining the fuel at a predetermined level. This float chamber has an outlet 3 opening into a perspective view of the air Specification of Letters Patent.

Patented Nov. 26, 1918. Renewed June 1, 1918. Serial No. 237,834.

valve casing 4 having a series of alining outlet ports 5.; Communicating with and extending upwardly from one of the end 'ports 5 is a starting nozzle 6, while addi tional nozzles 7 and 7 communicate with and extend upwardly from the remaining ports 5. Mounted for rotation within the casing 4 is a hollow cylindrical valve 8 which is in constant communication with the .port of nozzle 6. One end of the valve 8 has a stem 9 extending therefrom and secured to a segmental gear 10. Formed in the valve 8 are ports 11 of different lengths and extending in the direction of rotation of the valve, one of these ports 11 being provided for each port 5. One port 11 maintains nozzle-7 constantly in communication with outlet 3. The other ports 11 are so positioned and proportioned that, during the rotation of the valve 8 in one direction, the ports ll will be brought successively into communication with their respective ports 5 and with the fuel outlet 3 so that the nozzles 7 will be brought successively into communication with the outlet 3, each nozzle re maining in communication with the outlet 3 while the next adjoining nozzle is being placed in communication with said outlet. Thus ultimately all of the nozzles 7 are in communication with the float chamber 1. When valve 8 is rotated in the opposite direction, all of the nozzles 7 are successively cut out of communication with the outlet 3, nozzle 7 remaining in communication with said outlet, so as to constitute a low'speed or idling nozzle.

The valve casing 4 is secured to the bottom of a mixing chamber 12 and the series of nozzles 7 and 7 project upwardly into one end portion of this mixing chamber, said series of nozzles extending transversely of the chamber, The nozzle 6, however, does not extend into the mixing chamber but, instead, projects into one end of a bypass 13 formed in one wall. of the mixing chamber, this bypass having an outlet 14 between the butterfly or throttle valve 15 in the carbureter and the manifold end 16 of the carbureter. An air inlet opening 17 opens into the bypass 13 at one side of the nozzle 6 and a cylindrical valve 18 is mounted for rotation in the bypass and is adapted normally to close said bypass. The valve 18 is-provided with separate passages 19 and 20. The passage 19 is adapted to aline with the bypass 13 when the valve is in one position, thus to permit the free circulation the bypass from nozzle 6 The passage 20 is adapted of gas don the back portion of the bypass 13 where the nozzle 6 is located. and, consequently, there is no danger of leakage f gas past the valve 18 as a result of the suction set up by the engine while in motion.

Arranged back of the mixing chamber 12 is a valve casing which can be an integral part of the casing of the mixing chamber. This valve casing has one and open and also has a sight slot opening 23 in its back and mounted for rotation within the valve casing 2 is a hollow c .'lindrical valve 2st open at one end and provided with a longitudinal port which is preferably l-shaped. This port has an extension 25' at one end and back of the nozzle 7. Extension 25 is con stantly in communication with one end of an outlet port 26 in the form of a slot extending transversely of the rear Wall of the mixing chamber 12 approximately on a level with the upper ends of the nozzles T and 7. Port is so shaped and located that, during rotation of valve 2% in one direction, one corner portion of the port vv'll first come into register with port 26 directly back 01 that nozzle 7 which is first brought into com munication with the gas outlet 3. During further rotation of valve 24 the area. of the port 25 in communication with outlet port 26 increases gradually so that the amount of air supplied to the mixing chamber is increased. theslieet or" air thus discharged into the mixing chamber spreading from one side toward the other of the mixing chamber so that after the rotation of valve 2% has been completed, the sheet of air discharging into the mixing chamber 12 will extend throughout the width of said mixing chamber and back of all of the nozzles 7 and 7.

Valve 24 is provided at one end with a stem 27 to which is secured a segmental gear 28 constantly in mesh with the segmental gear 10. An arm 29 is formed with or seecured to the segmental gear 28 and is connected. by a link 30, to one arm of a lever 31 secured to the stem of the throttle valve 15. The gears 10 and 28 are so proportioned that when the throttle valve 15 is closed, the said gears Will operate both of the valves 24 and 8 so as'to completely close all but one end of the port 26 and all of the nozzles 7. When, however, the throttle valve 15 is partly opened, the gears 28 and 10 will be actuated simultaneously to admit a small quantity of air directly back of the first noz- Ul nozzle 3 ot as chamber 12.

is moved ioi sly as the throttle vane 'ther toward its full open po ition, more nozzles l' are brought into communication with t 1e outlet 3 and the supply of air to the port 26 is increased. importance is attached to the fact that the host of air di-= rected into the mixing chamber passes thereinto practi -all v across the ends oi the nozzles l and T and at right angles thereto with the result that as the leaves the nozzl s it is thoroughly broken up by the currents and a better mixture is thus obtained than would otherwise be the case.

Assuming that the throttle valve is closed and it is desired to start the engine the operator opens the valve 18 lo any snitable means provided for that purpose. i hus the passage 19 is brought into alinement with the bypass l3. and when the engine is started a rich mixture oit gas and will be directed thereinto from the nozzle *3 and the air inlet l'lfl this explosive mixture fiovving along the bypass l?) and past the throttle valve 15 to the manifold. The throttle valve can then be gradually opened as before described and valve 118 closed.

ll hat is claimed is 1. A carburetor including a mixing chamher. a float chamber associated therevvith valve casings. valves turning in the casings, nozzles rising from one valve easing into the mixing chamber, one of said nozzles being normally in communication vvith the float chamber and the air port, and means for revolving the valves to successively admit fuel to and direct air across a number of or all the nozzles.

2. A carbureter including a mixing ohamber formed with an elongated air inlet port, a float chamber associated therewith, valve casings. an air control and a fuel control valve. each turning in its respective casing, nozzles rising from one casing and extending into the mixing chamber and terminating before the air port, one of said nozzles being normally in communication with the float chamber, and means for simultaneously turning the valves to successively admit "fuel to and direct air across a desired number or all the nozzles.

lln testimony that l claim the foregoing as my own, I have hereto allixed my signature in the presence of two Witnesses.

RALPH A. DUFF.

"Witnesses:

C. Bnivs'rson, E. P. Anitsi'nono. 

